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Add code to load a key and obtain and verify a response from the user. 

git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@644 185d5e19-27fe-0310-9dcf-9bff6b9f3609
This commit is contained in:
Dag-Erling Smørgrav 2013-03-05 15:25:22 +00:00
parent e39d0abb85
commit bbcd45ace7
1 changed files with 41 additions and 4 deletions
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45
modules/pam_oath/pam_oath.c
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@ -33,7 +33,12 @@
# include "config.h"
#endif
#include <limits.h>
#include <pwd.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define PAM_SM_AUTH
#define PAM_SM_ACCOUNT
@ -41,14 +46,19 @@
#include <security/pam_modules.h>
#include <security/pam_appl.h>
#include "oath.h"
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags,
int argc, const char *argv[])
{
struct passwd *pwd;
const char *user;
char *password;
int pam_err;
char *keyfile;
struct oath_key *key;
unsigned long code;
char *password, *end;
int pam_err, ret;
(void)flags;
(void)argc;
@ -60,6 +70,19 @@ pam_sm_authenticate(pam_handle_t *pamh, int flags,
if ((pwd = getpwnam(user)) == NULL)
return (PAM_USER_UNKNOWN);
/* load key */
keyfile = calloc(1, strlen(pwd->pw_dir) + sizeof "/.otpauth");
if (keyfile == NULL)
return (PAM_SYSTEM_ERR);
sprintf(keyfile, "%s/.otpauth", pwd->pw_dir);
free(keyfile);
if ((key = oath_key_from_file(keyfile)) == NULL) {
/* no key, fake it? */
if (openpam_get_option(pamh, "fakeauth") == NULL)
return (PAM_AUTHINFO_UNAVAIL);
key = oath_dummy_key(om_hotp, oh_sha1, 6);
}
/* get code */
pam_err = pam_get_authtok(pamh, PAM_AUTHTOK,
(const char **)&password, NULL);
@ -68,8 +91,22 @@ pam_sm_authenticate(pam_handle_t *pamh, int flags,
if (pam_err != PAM_SUCCESS)
return (PAM_AUTH_ERR);
pam_err = PAM_AUTH_ERR;
return (pam_err);
/* convert to number */
code = strtoul(password, &end, 10);
if (end == password || *end != '\0')
code = ULONG_MAX;
/* verify response */
if (key->mode == om_hotp)
ret = oath_hotp_match(key, code, 1);
else
ret = oath_totp_match(key, code, 1);
oath_key_free(key);
if (ret != 0)
return (PAM_AUTH_ERR);
/* XXX write back */
return (PAM_SUCCESS);
}
PAM_EXTERN int